BoilerFaultCodesThe 6 most common faults
Your boiler has tried to light several times but has been unable to establish or maintain a flame, so it has shut down for safety.
Why it happens: This fault occurs when the boiler's control system fails to detect a stable flame after several attempts to fire up. The most common reasons include a lack of gas reaching the burner, a worn-out spark electrode that can no longer create a spark, or a dirty internal sensor that cannot 'see' the flame even if it has lit.
Check if other gas appliances, like a cooker, are working to ensure gas is being supplied to the property.Verify that your gas meter has credit if you use a pre-payment meter.Reset the boiler by pressing the 'Reset' button for a few seconds to see if it clears the lockout.
Your boiler has switched itself off because it has detected a dangerously high internal temperature, often caused by a lack of water flow or air being trapped in the unit.
Why it happens: This fault occurs when the water inside the heat exchanger becomes too hot too quickly, causing the safety sensors to shut the system down to prevent damage. The most common reason is a lack of water circulation, often caused by a failed pump, a blockage in the pipework, or air trapped within the unit. It can also happen if there is not enough water in the system to carry the heat away from the burner.
Check the boiler pressure gauge and top it up to 1.5 bar if it is lowCheck that all radiator valves and boiler isolation valves are fully openGently bleed your radiators to remove any trapped airPress the 'Reset' button on the boiler control panel
Your boiler has sensed that water is not circulating quickly enough through the system, so it has safely shut down to prevent overheating.
Why it happens: This fault occurs when the temperature difference between the water leaving the boiler and returning to it becomes too wide, indicating that heat isn't being carried away fast enough. The most common reasons are a failing internal pump that can't push the water through, or a blockage caused by a buildup of sludge and debris in the system. When the water moves too slowly, it lingers in the heat exchanger and risks boiling, triggering a safety shutdown.
Check that all radiator valves are fully openEnsure the central heating pump is running and hasn't seizedCheck that the system pressure gauge is between 1 and 1.5 barBleed all radiators to remove trapped air
Your boiler is not firing up because it cannot detect a flame, meaning your heating and hot water will not work.
Why it happens: This fault happens because the boiler has tried to ignite five times but failed to detect a steady flame. It is usually caused by a worn-out ignition spark or a dirty sensor that can no longer 'see' the fire, though it can also occur if the gas supply is interrupted. Essentially, the safety system has stepped in to stop the boiler from trying to light unsuccessfully.
Check if other gas appliances, like a hob, are working to confirm gas supply.Check if your gas meter has credit or if the emergency control valve is open.Press the 'Reset' button on the boiler control panel for 3 seconds.
Your boiler has lost power after a previous fault occurred, which has cleared the original error message and prevented it from restarting.
Why it happens: This fault happens when the boiler loses its electrical supply immediately after a different internal problem caused it to shut down. Because the power was cut or interrupted during the shutdown process, the boiler's computer has 'forgotten' what the initial problem was and cannot safely restart. It is often caused by a failing main circuit board or a loose electrical connection that fails under the stress of a system error.
Locate the reset button on the front control panel.Press and hold the reset button for 2-3 seconds.Wait to see if the boiler restarts and displays a different numerical code.
Your boiler has shut down because the water returning to the unit is too hot, which usually means the water isn't flowing through your radiators properly.
Why it happens: This fault occurs when the water returning from your radiators back to the boiler is at a higher temperature than it should be, causing the system to stop for safety. The most common reason is a restriction in water flow, often caused by a failing pump or debris buildup like iron oxide 'sludge' blocking the internal pipework. It can also be triggered if too many radiator valves are turned off at once, leaving the hot water with nowhere to circulate.
Check that at least two or three radiator valves (TRVs) are turned to the highest settingEnsure the central heating pump is running and hasn't seizedCheck if any external bypass valves are closed and open them if necessary
on the Remeha Quinta 30
Based on parts cited in our fault code database. Your engineer will confirm what's actually needed after diagnosis.
Call a Gas Safe engineer if…
- You can smell gas or see signs of a leak
- The Remeha shows an Emergency or High severity code
- The boiler keeps locking out after repeated resets
- You've tried the DIY checks and the fault hasn't cleared
- There's visible water leaking from the boiler
- The flame is yellow or orange instead of blue